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arm64/mm: Unify CONT_PMD_SHIFT

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Similar to how CONT_PTE_SHIFT is determined, this introduces a new
kernel option (CONFIG_CONT_PMD_SHIFT) to determine CONT_PMD_SHIFT.

Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20200910095936.20307-3-gshan@redhat.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Gavin Shan 2020-09-10 19:59:36 +10:00 committed by Will Deacon
parent c0d6de327f
commit e676594115
2 changed files with 8 additions and 8 deletions
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6
arch/arm64/Kconfig
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@ -217,6 +217,12 @@ config ARM64_CONT_PTE_SHIFT
default 7 if ARM64_16K_PAGES
default 4
config ARM64_CONT_PMD_SHIFT
int
default 5 if ARM64_64K_PAGES
default 5 if ARM64_16K_PAGES
default 4
config ARCH_MMAP_RND_BITS_MIN
default 14 if ARM64_64K_PAGES
default 16 if ARM64_16K_PAGES

10
arch/arm64/include/asm/pgtable-hwdef.h
View File

@ -82,17 +82,11 @@
* Contiguous page definitions.
*/
#define CONT_PTE_SHIFT (CONFIG_ARM64_CONT_PTE_SHIFT + PAGE_SHIFT)
#ifdef CONFIG_ARM64_64K_PAGES
#define CONT_PMD_SHIFT (5 + PMD_SHIFT)
#elif defined(CONFIG_ARM64_16K_PAGES)
#define CONT_PMD_SHIFT (5 + PMD_SHIFT)
#else
#define CONT_PMD_SHIFT (4 + PMD_SHIFT)
#endif
#define CONT_PTES (1 << (CONT_PTE_SHIFT - PAGE_SHIFT))
#define CONT_PTE_SIZE (CONT_PTES * PAGE_SIZE)
#define CONT_PTE_MASK (~(CONT_PTE_SIZE - 1))
#define CONT_PMD_SHIFT (CONFIG_ARM64_CONT_PMD_SHIFT + PMD_SHIFT)
#define CONT_PMDS (1 << (CONT_PMD_SHIFT - PMD_SHIFT))
#define CONT_PMD_SIZE (CONT_PMDS * PMD_SIZE)
#define CONT_PMD_MASK (~(CONT_PMD_SIZE - 1))